为进一步降低船用双燃料发动机NOx排放，探究废气再循环（EGR）技术对双燃料发动机燃烧过程影响。本文基于船用大缸径发动机试验数据建立并标定双燃料发动机模型，研究分析稀薄状态下不同CO2/H2O比例下发动机燃烧过程。结果表明，引入废气后放热率峰值和缸内温度均大幅下降，随着水蒸气比重增加，燃烧速度减慢，发动机动力性下降。喷油时刻对空气稀释下燃烧稳定性影响较复合稀释大。复合稀释下适当提前喷油时刻可改善发动机的经济性能，提高燃烧连续性，且NOx排放相较于纯空气稀释低56%～71%，远低于IMO第三阶段排放标准。
In order to further reduce NOx emissions from Marine dual-fuel engines, the effects of exhaust gas recirculation (EGR) technology on combustion process of dual-fuel engines are investigated. A dual-fuel engine model is established and calibrated based on the test data of marine large-bore engine, and the engine combustion process under different CO2/H2O ratio are studied and analyzed. The results show that the peak heat release rate and the temperature in the cylinder decrease significantly after the introduction of exhaust gas. With the increase of the proportion of water vapor, the combustion speed decreases and the engine power decreases. It founds that the SOI have greater influence on combustion stability under air dilution than compound dilution. Appropriate advance SOI under compound dilution can improve engine economic performance and combustion continuity, and NOx emission is 56% to 71% lower than that of pure air dilution, which is far lower than IMO Tier Ⅲ emission standards.
2024,46(22): 124-129 收稿日期：2024-1-26
DOI：10.3404/j.issn.1672-7649.2024.22.022
分类号：U664.12
基金项目：江苏省镇江市重大科研项目（2145072207）
作者简介：梁洁雯(1998-),女,硕士研究生,研究方向为双燃料发动机燃烧和排放
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